Researchers at Oxfam, a nonprofit devoted to combating poverty, examined billionaires who collectively own $2.4 trillion in company equity, with investments across 183 companies.

Under the rule proposals, companies would be required to share information about their greenhouse gas emissions as well as climate-related risks faced by their businesses.

Building and operating telescopes can generate a lot of greenhouse gases. In fact, it's as if each astronomer in the world was driving more than 100,000 miles per year, a new study finds.

The SEC is expected on Monday to propose new requirements for companies to disclose their greenhouse gas emissions and risks to their businesses from climate change.

Carbon offsets got a big boost from November's U.N. climate summit. New rules could make it easier for companies to pay for carbon-cutting projects in other countries, rather than doing it themselves.

China is the world's largest carbon emitter, after the U.S., producing an estimated 27% of global greenhouse gases. Kerry is in the country for talks on stronger efforts to curb rising temperatures.

Scientists who warned of heat waves and rising seas this week also say that it's possible to avoid the worst effects of the warming climate. They're relying on computer models of the world economy.